SMA SC 500U Installation - Manual (Page 29)

SMA Solar Technology AG
Installation Guide SC500U-IUS093411 29
5.4.3 Connect the Cables in the Magnetics Cabinet
This section shows you how to connect cables W53,
W53.1, W54, W54.1, W55 and W55.1 to the rails
under the transformers in the magnetics cabinet.
Figure to the right: Layout for connecting a cable lug to
the rail in the Control Cabinet.
1. Before connecting the cables, clean the contact surfaces.
2. Use only the non-woven abrasive delivered with the Sunny Central. Do not clean the surfaces
with sandpaper.
3. Do not touch the contact surfaces after they have been cleaned.
4. Place the cable gland with the 6 AC cables and the ground cable on the opening of the
magnetics cabinet.
5. Attach and tighten the four screws on each side.
A Nut
B Lock washer
C Cable lug
D Rail
E Screw head
NOTICE
When transporting and storing the Sunny Central, oxide layers may form on the contact
surfaces of the cable connection.
Yield loss due to poor electrical conductivity.
6. Connect cable W53 and W53.1 to rail A.
7. Connect cable W54 and W54.1 to rail B.
8. Connect cable W55 and W55.1 to rail C.
9. Tighten all terminal connection bolts with a torque
wrench to 230 in-lbs (26 Nm).
A
B
C
D
C
B
E
A B C
A B C
Stop S tart